Water-tube boiler.



through the boiler, whereby the heating UNITE srars ran'r rich.

GEORGE COOK, BUFFALO, NEW YORK.

WATER-TUBE BOILER.

To all whom it may concern:

ful Improvements in WVater-Tube Boilers;

and I do hereby declare the following to be? a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to water-tube boilers; of the type shown in myPatent, No. 566,500,, dated August 25, 1896, and is designated as animprovement over this patented boiler.

The principal ob ects of the invention are to secure a bettercirculation of water capacity thereof is increased, and to simplify theconstruction so that the boiler will be cheaper to manufacture and canbe more quickly put together or erected.

Other objects will become apparent from;

' the following description.

bination, with the usual inner and outer shells of the boiler, of aplurality of cast metal open work water circulating frames arrangedtransversely within the inner shell and having the tubes of each framein line with openings in the frame above and below, as the case may be,or both above and below, these frames having communication with thewater space between said shells and through which the water is adaptedto circulate; the products of combustion having free access to the tubesof, said frames because they are obliged to pass through the intersticesor openings between said tubes.

My invention also consists in the features of construction andcombination of parts hereinafter described and specified in the claims.

In the accompanying drawing illustrating the preferred embodiment of myinvention: Figure 1 is a central vertical sectional view of a boilerconstructed in accordance with my invention. Fig. 2 is a cross sectionon the line 00-02 of Fig. 1. Fig. 3 is a similar view showing a modifiedconstruction of cast metal frame which may be substituted for the formshown in Figs. 1 and 2, if desired, and, Fig. 4 is an enlarged detailedview Specification of Letters Patent.

Application filed April 28, 1909.

Patented Nov. 14, 1911.

Serial No. 492,652.

showing the application of the short tube sections which connect each ofthe cast metal frames to the inner shell.

The inner and outer shells 1 and 2, respectively, are round in crosssection so that the general shape of the boiler is cylindrical. Thelower portion of the interior of the inner shell comprises the fire box3, to which access is had through the door 4, and door frame 5, thelatter having watertight joints with the inner and outer shells. Thesmoke stack includes a pipe section 5 extending through the center ofthe tops of the inner and outer shells'with which it has water-tightjoints. Stay bolts 6 are preferably placed at intervals between the topsof the inner and outer shells and may be employed at any other pointswhere they are found to be necessary. Cast metal circulating frames 7are placed transversely within the inner shell at suitable intervals.Each frame, as shown in Figs. 1 and 2, comprises a circular tube 8 atthe outer edge I thereof and a series of cross tubes 9 ar- The inventlonconsists broadlyof the com-;

.10 leading to the interior of the circular tube 8 and extending outwardinto close proximity with the interior surface of the inner shell. Ihave shown six of these collars on each frame as being the preferablenumber, but more or less may be employed, if necessary or desirable.These collars are cast integral with the frames but are preferably madewith thicker walls than the tubes to stand the expansion therein of theshort tube sections 11 which connect the frames to the inner shell andare the only means for holding these frames in place; thus permittingeasier removal of said frames without disarranging other parts. Thisresults in a very simple boiler wherein repairs can be easily made,since each part is separately detachable. The collars 10 also serve tocenter the frames in the inner shell. The openings in the inner shell toreceive these short tube sections are so placed as to give the frames aslight incline, as shown in Fig. 1, which facilitates the circulation ofthe water through the frames. Hand holes 12 are provided in the outershell opposite the short tube sections.

In putting the boiler together, each of the frames is introduced intothe shell, brought to proper position opposite the openings in saidshell and secured in place by inserting the short tube sections throughthe hand holes in the outer shell and expanding said tube sections tomake water-tight joints with the collars 10 and the inner shell. Theopenings 12 in the outer shell are normally closed by plugs 13. Each ofthe frames 7 may be turned with respect to the one next to it so thatthe cross pipes of the several frames will be staggered, or in otherwords, so that these cross pipes will be directed across the openings orinterstices in the frames directly beneath, which tends to increase theheating capacity of the boiler by compelling the products of combustionto take tortuous passages among said cross pipes from the fire box tothe smoke pipe. Short tubes 14 are placed between the inner and outershells, one being preferably arranged intermediate of each pair ofadjacentframes, for the purpose of introducing steam or water forcleaning said frames and the interior of the boiler. These tubes 14 arenormally closed by plugs 15.

As illustrated in Fig. 3, the frames may be made of a series ofconcentric circular tubes 16 connected by radial tubes 17 in a sort ofcob-web fashion instead of the network of cross pipes shown in Fig. 2.The frames made in this modified form may be staggered with respect toone another and secured to the inner shell in the same manner as alreadydescribed in connection with the preferred form.

I claim 1. In a water tube boiler, the combination with upright innerand outer shells separated by a water space, a fire box at the bottom ofthe inner shell and a smoke pipe at the upper end of said inner shell,of a cast metal water circulating frame arranged transversely in theinner shell between said fire box and said smoke pipe and incommunication with said water space, a tube for introducing steam orwater to the exterior of said circulating frame and the interior of theinner shell to cleanse both, said tube connecting said outer shell withsaid inner shell and positioned in aplane beneath said smoke pipe andmeans for closing the outer end of said tube for the purpose specified.

2. In a water tube boiler, the combination with upright outer and innershells separated by a water space, a fire box at the bottom of saidinner shell and a smoke pipe at the upper end of said inner shell, of aplu rality of cast metal water circulating frames arranged transverselyin the inner shell between said fire box and said smoke pipe and incommunication with said water space, a tube for introducing steam orwater to the exterior of said circulating frame and the interior of theinner shell and positioned in a plane between said water circulatingframes and means for closing the outer end of said tube.

In testimony whereof, I affix my signature, in presence of twowitnesses.

GEORGE COOK. \Vitnesses:

J osnrrr R. EDSON, A. M. PARKINS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

